The Rex House, also known as the Gemberling-Rex House, is an historic, American home that is located in Schaefferstown in Heidelberg Township, Lebanon County, Pennsylvania. Built in 1729 by early Pennsylvania German settlers, his structure is a 2+1⁄2-story, half timbered residence with originally scored plaster exterior and, currently, a horizontal woo…The Rex House, also known as the Gemberling-Rex House, is an historic, American home that is located in Schaefferstown in Heidelberg Township, Lebanon County, Pennsylvania. Built in 1729 by early Pennsylvania German settlers, his structure is a 2+1⁄2-story, half timbered residence with originally scored plaster exterior and, currently, a horizontal wooden siding and a gable roof. It measures thirty-two feet by twelve feet and has gable end brick chimneys. Also on the property are a contributing smoke house, bake oven, stone foundation of a barn and outhouse and cistern.